While you cannot download a standalone, permanent free version of Autodesk Build, you can legally access it at no cost in two ways: Autodesk offers a 30-day free trial of Autodesk Build with full functionality.
Note: Autodesk Build is a premium construction management software. There is no permanent "free version" for download, but Autodesk does offer a free trial and a free limited-access product. Autodesk Build is a powerful field execution and project management tool designed to connect office, team, and field. It helps manage RFIs, submittals, checklists, issues, and photos. autodesk build free download